Swift - Retrieving Image from Core Data

Question

I've searched over the internet (mostly here) about my issue and I've tried them but I still can't get this to work. I'm trying to retrieve the image from the core data and then display it on a table view. So basically, a table view with a thumbnail image along with a name and a switch. I have the following swift files below. Can anyone lead me what to do? Aside from the image retrieving, I'm planning to add a switch that when turned on/off it asks for a password so that it can be switched on/off. How can I start this? Hoping for your kind responses. Thank you!

I have this snippet of code for saving a record including an image to core data.

let mOC =
(UIApplication.sharedApplication().delegate
    as! AppDelegate).managedObjectContext

@IBOutlet weak var firstName: UITextField!
@IBOutlet weak var lastName: UITextField!
@IBOutlet weak var status: UILabel!

@IBAction func saveRecord(sender: AnyObject) {
    let entityDescription =
    NSEntityDescription.entityForName("Faculty",
        inManagedObjectContext: mOC)

    let faculty = Faculty(entity: entityDescription!,
        insertIntoManagedObjectContext: mOC)

    faculty.firstname = firstName.text
    faculty.lastname = lastName.text

    let pickedImage = UIImageJPEGRepresentation(imageView.image!, 1.0)

    faculty.image = pickedImage

    do {
        try mOC.save()
        firstName.text = ""
        lastName.text = ""

        status.text = "New record saved."
        NSNotificationCenter.defaultCenter().postNotificationName("load", object: nil)
        self.dismissViewControllerAnimated(true, completion: nil)
    } catch {
        status.text = "Record not saved."
    }

}

@IBOutlet weak var imageView: UIImageView!
var newMedia : Bool?
@IBAction func choosePhoto(sender: AnyObject) {
    if UIImagePickerController.isSourceTypeAvailable(
        UIImagePickerControllerSourceType.SavedPhotosAlbum) {
            let imagePicker = UIImagePickerController()

            imagePicker.delegate = self
            imagePicker.sourceType =
                UIImagePickerControllerSourceType.PhotoLibrary
            imagePicker.mediaTypes = [kUTTypeImage as String]
            imagePicker.allowsEditing = false
            self.presentViewController(imagePicker, animated: true,
                completion: nil)
            newMedia = false

    }

}

This is the TableViewController which displays the records on the table view and supposedly with the image, the one I'm trying to figure out.

let managedObjectContext =
(UIApplication.sharedApplication().delegate
    as! AppDelegate).managedObjectContext

var fetchedLastName = [String]()
var fetchedFirstName = [String]()

override func viewDidLoad() {
    super.viewDidLoad()

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "reloadData:",name:"load", object: nil)

    let entityDescription =
    NSEntityDescription.entityForName("Faculty",
        inManagedObjectContext: managedObjectContext)

    let request = NSFetchRequest()
    request.entity = entityDescription

    do{
        let objects = try managedObjectContext.executeFetchRequest(request)

        let results = objects

        if results.count > 0 {
            for var i = 0; i < results.count; i += 1{
                let match = results[i] as! NSManagedObject

                fetchedLastName.append((match.valueForKey("lastname") as? String)!)
                fetchedFirstName.append((match.valueForKey("firstname") as? String)!)

            }
        } else {

        }
    }
    catch{}
}

func reloadData(notification: NSNotification){
    fetchedLastName.removeAll()
    fetchedFirstName.removeAll()

    let entityDescription =
    NSEntityDescription.entityForName("Faculty",
        inManagedObjectContext: managedObjectContext)

    let request = NSFetchRequest()
    request.entity = entityDescription

    do{
        let objects = try managedObjectContext.executeFetchRequest(request)

        let results = objects

        if results.count > 0 {
            for var i = 0; i < results.count; i += 1{
                let match = results[i] as! NSManagedObject

                fetchedLastName.append((match.valueForKey("lastname") as? String)!)
                fetchedFirstName.append((match.valueForKey("firstname") as? String)!)
            }
        } else {

        }
    }
    catch{}

    self.tableView.reloadData()
}

Am I right to think that it is somewhere here that I should write the code to retrieve the image from the core data and display it on the table view?

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("TEACH", forIndexPath: indexPath) as! TEACHTableViewCell

    let row = indexPath.row

    cell.facultyName.text = fetchedLastName[row] + ", " + fetchedFirstName[row]

    return cell
}

Answer 1

Ok here is the fixed code:

TeachTableViewController:

//
//  TEACHTableViewController.swift
//  TEACH
//
//  Created by ICST340.N1 on 9/29/15.
//  Copyright © 2015 IyoTugs. All rights reserved.
//

import UIKit
import CoreData

class TEACHTableViewController: UITableViewController {
let managedObjectContext =
(UIApplication.sharedApplication().delegate
    as! AppDelegate).managedObjectContext

var fetchedLastName = [String]()
var fetchedFirstName = [String]()
var fetchedImage = [UIImage]()

override func viewDidLoad() {
    super.viewDidLoad()

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "reloadData:",name:"load", object: nil)

    let entityDescription =
    NSEntityDescription.entityForName("Faculty",
        inManagedObjectContext: managedObjectContext)

    let request = NSFetchRequest()
    request.entity = entityDescription

    do{
        let objects = try managedObjectContext.executeFetchRequest(request)

        let results = objects

        if results.count > 0 {
            for var i = 0; i < results.count; i += 1{
                let match = results[i] as! NSManagedObject

                fetchedLastName.append((match.valueForKey("lastname") as? String)!)
                fetchedFirstName.append((match.valueForKey("firstname") as? String)!)
                //added this is convert the image
                let image = match.valueForKey("image") as! NSData
                fetchedImage.append(UIImage(data: image)!)

            }
        } else {

        }
    }
    catch{}
    // Uncomment the following line to preserve selection between presentations
    // self.clearsSelectionOnViewWillAppear = false

    // Uncommented this
    // Uncomment the following line to display an Edit button in the          navigation bar for this view controller.
    //        self.navigationItem.rightBarButtonItem = self.editButtonItem()
}

func reloadData(notification: NSNotification){
    fetchedLastName.removeAll()
    fetchedFirstName.removeAll()
    //Added this to remove all images
    fetchedImage.removeAll()

    let entityDescription =
    NSEntityDescription.entityForName("Faculty",
        inManagedObjectContext: managedObjectContext)

    let request = NSFetchRequest()
    request.entity = entityDescription

    do{
        let objects = try managedObjectContext.executeFetchRequest(request)

        let results = objects

        if results.count > 0 {
            for var i = 0; i < results.count; i += 1{
                let match = results[i] as! NSManagedObject

                fetchedLastName.append((match.valueForKey("lastname") as? String)!)
                fetchedFirstName.append((match.valueForKey("firstname") as? String)!)
                //added this is convert the image
                let image = match.valueForKey("image") as! NSData
                fetchedImage.append(UIImage(data: image)!)

            }
        } else {

        }
    }
    catch{}

    self.tableView.reloadData()
}


override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

// MARK: - Table view data source

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 1
}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    return fetchedLastName.count
}


override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("TEACH", forIndexPath: indexPath) as! TEACHTableViewCell

    let row = indexPath.row

    print(fetchedFirstName)

    cell.facultyName.text = fetchedLastName[row] + ", " + fetchedFirstName[row]
    cell.facultyImage.image = fetchedImage[row]

    return cell
}

}

I marked each spot that I fixed, but there were only four spots. Two of them had to do with taking the NSData and turning it into an Image(in viewDidLoad and reloadData, same spots). One of them add to do with commenting out the line that made the right navbar button an edit button. And the last one fetchedImage.removeAll() on the top of reloadData to take out all of the images.

Answer 2

Solved by doing so:

var fetchedImage = [NSData]()

fetchedImage.append((match.valueForKey("image") as? NSData)!)

and

cell.facultyImage.image = fetchedImage[row]

Answer 3

Not quite sure what Faculty() contains but, you need to save the image as NSData to CoreData, then when you want to get the image from CoreData you take the NSData and convert it to an image like so:

let image = UIImage(named: "BackgroundSky")
//Change named: "" to your image
let imageAsNSData = UIImageJPEGRepresentation(image!, 1.0)

And then save it to CoreData as NSData, then when you get that back from CoreData, this is how you turn it into an image:

let image = UIImage(data: imageAsNSData!)
//Change data: to the NSData

And that is how change and image back and forth from UIImage to NSData.